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Detection rules › Sigma

Scheduled Tasks Names Used By SVR For GraphicalProton Backdoor

Status
test
Severity
high
Log source
product windows, service security
Author
CISA
Source
github.com/SigmaHQ/sigma

Hunts for known SVR-specific scheduled task names

MITRE ATT&CK coverage

TacticTechniques
PersistenceNo specific technique

Event coverage

ProviderEventTitle
Security-AuditingEvent ID 4698A scheduled task was created.
Security-AuditingEvent ID 4699A scheduled task was deleted.
Security-AuditingEvent ID 4702A scheduled task was updated.

Rule body yaml

title: Scheduled Tasks Names Used By SVR For GraphicalProton Backdoor
id: 8fa65166-f463-4fd2-ad4f-1436133c52e1
related:
    - id: 2bfc1373-0220-4fbd-8b10-33ddafd2a142
      type: similar
status: test
description: Hunts for known SVR-specific scheduled task names
author: CISA
references:
    - https://www.cisa.gov/news-events/cybersecurity-advisories/aa23-347a
date: 2023-12-18
tags:
    - attack.persistence
    - detection.emerging-threats
logsource:
    service: security
    product: windows
detection:
    selection:
        EventID:
            - 4698
            - 4699
            - 4702
        TaskName:
            - '\defender'
            - '\Microsoft\DefenderService'
            - '\Microsoft\Windows\Application Experience\StartupAppTaskCheck'
            - '\Microsoft\Windows\Application Experience\StartupAppTaskCkeck'
            - '\Microsoft\Windows\ATPUpd'
            - '\Microsoft\Windows\Data Integrity Scan\Data Integrity Update'
            - '\Microsoft\Windows\DefenderUPDService'
            - '\Microsoft\Windows\IISUpdateService'
            - '\Microsoft\Windows\Speech\SpeechModelInstallTask'
            - '\Microsoft\Windows\WiMSDFS'
            - '\Microsoft\Windows\Windows Defender\Defender Update Service'
            - '\Microsoft\Windows\Windows Defender\Service Update'
            - '\Microsoft\Windows\Windows Error Reporting\CheckReporting'
            - '\Microsoft\Windows\Windows Error Reporting\SubmitReporting'
            - '\Microsoft\Windows\Windows Filtering Platform\BfeOnServiceStart'
            - '\Microsoft\Windows\WindowsDefenderService'
            - '\Microsoft\Windows\WindowsDefenderService2'
            - '\Microsoft\Windows\WindowsUpdate\Scheduled AutoCheck'
            - '\Microsoft\Windows\WindowsUpdate\Scheduled Check'
            - '\WindowUpdate'
    condition: selection
falsepositives:
    - Unknown
level: high

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    EventID:
        - 4698
        - 4699
        - 4702
    TaskName:
        - '\defender'
        - '\Microsoft\DefenderService'
        - '\Microsoft\Windows\Application Experience\StartupAppTaskCheck'
        - '\Microsoft\Windows\Application Experience\StartupAppTaskCkeck'
        - '\Microsoft\Windows\ATPUpd'
        - '\Microsoft\Windows\Data Integrity Scan\Data Integrity Update'
        - '\Microsoft\Windows\DefenderUPDService'
        - '\Microsoft\Windows\IISUpdateService'
        - '\Microsoft\Windows\Speech\SpeechModelInstallTask'
        - '\Microsoft\Windows\WiMSDFS'
        - '\Microsoft\Windows\Windows Defender\Defender Update Service'
        - '\Microsoft\Windows\Windows Defender\Service Update'
        - '\Microsoft\Windows\Windows Error Reporting\CheckReporting'
        - '\Microsoft\Windows\Windows Error Reporting\SubmitReporting'
        - '\Microsoft\Windows\Windows Filtering Platform\BfeOnServiceStart'
        - '\Microsoft\Windows\WindowsDefenderService'
        - '\Microsoft\Windows\WindowsDefenderService2'
        - '\Microsoft\Windows\WindowsUpdate\Scheduled AutoCheck'
        - '\Microsoft\Windows\WindowsUpdate\Scheduled Check'
        - '\WindowUpdate'

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

FieldKindValues
TaskNameeq
  • \Microsoft\DefenderService corpus 2 (sigma 2)
  • \Microsoft\Windows\ATPUpd corpus 2 (sigma 2)
  • \Microsoft\Windows\Application Experience\StartupAppTaskCheck corpus 2 (sigma 2)
  • \Microsoft\Windows\Application Experience\StartupAppTaskCkeck corpus 2 (sigma 2)
  • \Microsoft\Windows\Data Integrity Scan\Data Integrity Update corpus 2 (sigma 2)
  • \Microsoft\Windows\DefenderUPDService corpus 2 (sigma 2)
  • \Microsoft\Windows\IISUpdateService corpus 2 (sigma 2)
  • \Microsoft\Windows\Speech\SpeechModelInstallTask corpus 2 (sigma 2)
  • \Microsoft\Windows\WiMSDFS corpus 2 (sigma 2)
  • \Microsoft\Windows\Windows Defender\Defender Update Service corpus 2 (sigma 2)
  • \Microsoft\Windows\Windows Defender\Service Update corpus 2 (sigma 2)
  • \Microsoft\Windows\Windows Error Reporting\CheckReporting corpus 2 (sigma 2)
  • \Microsoft\Windows\Windows Error Reporting\SubmitReporting corpus 2 (sigma 2)
  • \Microsoft\Windows\Windows Filtering Platform\BfeOnServiceStart corpus 2 (sigma 2)
  • \Microsoft\Windows\WindowsDefenderService corpus 2 (sigma 2)
  • \Microsoft\Windows\WindowsDefenderService2 corpus 2 (sigma 2)
  • \Microsoft\Windows\WindowsUpdate\Scheduled AutoCheck corpus 2 (sigma 2)
  • \Microsoft\Windows\WindowsUpdate\Scheduled Check corpus 2 (sigma 2)
  • \WindowUpdate corpus 2 (sigma 2)
  • \defender corpus 2 (sigma 2)